inSSIDer shows my wireless network as RSNA-CCMP. The settings on the wireless router (Linksys E2000) do not at all seem to suggest an "RSNA" security option. The security filtering options in inSSIDer have both a WPA2-CCMP and RSNA-CCMP available.

From what I can gather, for practical purposes these are the same thing, just different name. RSNA stands for Robust Security Network Assocation, which is part of the 802.11i spec (per this article on Wikipedia )